Safety-stop for engine-governors



(No Modl.) 2 Sheets-Sheet 1.,

J. BARCLAY. SAFETY STOP FOR'E'NGINE'GOVERNORS. N0. 492,258. PatentedFeb. 21, 1893..

o w A o N 7 WITNESSES: INVENTOH i ATTORNEYS.

(No Model.) 2 Sheets-Sheet 2.

J. BARCLAY. SAFETY'STOP FOR ENGINE GOVERNORS.

No. 492,258. Patented Feb. 21,1893.

WITNESSES; INVENTOH u ATTORNEYS.

m: NORRIS PETERS co, Pumuurm WASHINGTON, o. c.

UNITED STATES PATENT OFFICE...

JAMES BARCLAY, OF SIOUX OITY,IOWA.

SAFETY-STOP FOR ENGINE-GOVERNORS.

SPECIFICATION forming part of Letters Patent No. 492,258, dated February21, 1893.

Application filed December 2, 1892. Serial No. 453,800. (No modeLl Toall whom it may concern.-

Be it known that I, JAMES BARCLAY,Of Sioux City, in the county ofWVoodbury and State of Iowa, have invented a new and Improved AutomaticSafety-Stop for Engine-Governors, of which the following is a full,clear, and exact description.

The invention relates to governors for all engines and especially forthe Corliss type, and its object is to provide a new and improved safetystop for all kinds ofrengine governors, which is simple and durable inconstruction, very effective and automatic in operation, and arranged topermit the governor, in case of accident, to drop sufficiently to throwthe cams on the knock-off levers into action to prevent the cylinderfrom taking steam.

The invention consists of a stop adapted to support the governor sleevewhen the motive agent is shut oif, and to move from under the governorwhen the engine is running.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is a side elevation of the improvement as applied; Fig. 2 is anenlarged transverse section of the same on the line 2-2 of Fig. 1; Fig.3 is an enlarged face view of the stop; Fig. lisa transverse section ofthe same on the line 4-4 of Fig. 3; and Fig. 5 is asectional plan viewof the same on the line 5-5 of Fig. 3.

The engine A, of any approved construction is provided with the usualgovernor B, or any other governor, connected with the valve mechanism ofCorliss type of engine, or with the valve stem of throttling governors,so that further description of the same is not deemed necessary.

The governor B is provided with its usual sleeve 0, adapted to rest on astop preferably made in the shape of a lever D, when the steam is shutoff by the engineer. When, however, an accident happens to the governorwhile the engine is running, the stop D being from under the sleeve 0permits the governor to drop sufficiently so as to completely shut offthe steam from the engine.

It is understood that when the stop lever D supports the sleeve when thesteam is shut off by the engineer closing the valve, then the valves ofthe engine are still in position to take steam as soon as the engineeragain opens the valve to start the engine. This stop lever D iscontrolled by the motive agent, and for this purpose, the followingarrangement is made. a casing E attached to the support of the governor,as plainly shown in Fig. 1. The lever D is provided with an extension Dpivotally connected by a link E with the closed end F of a spring tube Fpreferably bent in the shape of a segment of a circle, as plainly shownin Figs. 1 and 3.

The spring tube F is arranged within the casing E and is connected atits open end with The lever D is fulcrumed at D within a pipe G leadingto the supply pipe or other part of the steam chest so that the motiveagent can enter the said pipe G whenever the valvecontrollingtheinletofthesteamthrough theinlet pipe is opened. Now, it will be seen that whenthe motive agent passes through the pipe G into the tube F, the latterswings outward at its free end as shown in dotted lines in Fig. 3, thusexerting with this free end, a pull on the extension D of the lever D,whereby the latter swings from under the sleeve C to permit the latterto drop below its normal position in case of accident to the governor.As soon as the motive agent is cut off from the pipe G by closing thevalve in the inlet pipe to the cylinder, then the tube F is relieved ofthe pressure of the steam and consequently its free end contracts so asto move the lever D back to its normal vertical position, as illustratedin Fig. 3, to support the sleeve 0 in a normal position. Now, it will beseen that while the engine is running, the lever D is swung from underthe sleeve 0 by the pressure of the steam in the spring tube F so thatin case of accident to the governor B, the latter can drop sufficientlyto throw the cams on the knock-off levers into action sothat the steamhooks cannot catch and open the valves, thus cutting off the steamsupply and thereby stopping the engine When the engine is runningnormally and the lever D has swung from under the sleeve 0, as abovementioned and the engineer shuts off the steam from the supply pipe,then the lever D swings back to its normal position before the enginecomes to a stop so that the lever D is ready to receive and support theICC sleeve 0, thus holding the governor in the proper position.

It is understood that I do not limit myself to the special constructionand application of the stop for Corliss engines only, as the stop may bedifferently constructed and controlled bysteam or motive power of theengine. Steam may be used for controlling the stop from the throttlingvalve, or the pipe between valve and cylinder or from the latter.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent 1. In an automatic safety stop for enginegovernors, the combination with a governor, of means controlled by themotive agent for supporting the governor when the motive agent is cutoil, substantially as set forth.

2. In an automatic safety stop for engine governors, the combinationwith a governor, of a support for the governor when the motive agent iscut off, said support being controlled by the motive agent and adaptedtobe moved from under the governor while the engine is running,substantially as described.

3. An automatic safety stop for engine governors, provided with a stoplever controlled by the motive agent of the engine, and adapted tosupport the governor when the motive agent is shut off, substantially asshown and described.

4. An automatic safety stop for engine governors, comprising a leveradapted to support the governor in a normal position, and a spring tubeconnected with the said lever and connected with the steam supply forthe engine, substantially as shown and described.-

5. An automatic safety stop for engine governors, comprising a leveradapted to support the governor in a normal position, a link connectedwith an extension of the said lever, a spring tube closed at one end andconnected at this closed end with the said link, and a pipe connectedwith the said tube and also connected with the steam supply,substantially as shown and described, 7

JAMES BARCLAY. WVitnesses:

J. E. GILPIN, L. S. LAMAR.

